some South-American Muridse. 141 



The following are also referable to the genus : — 

 Eligmodontia hirlipes, Thos. (desciibed as PhylJolis 

 hirtipes). 



„ moreni, Thos. [Eligmodon moreni). 



,, morgan!^ All. 



„ morgani i^amparum, Thos. 



Hesperomys, Waterh., 1839. 



Svn. Calonvjs, Waterli., 1837, nee Callomys, d'Orb. & Geoff., 1830. 



Size small or medium. Form delicate. Ears short. Tail 

 short, rarely attaining the length of the head and body. 

 Feet normal, slender, the pads 5-6, not covered by hair ; 

 surface of palms and soles generally naked, but occasionally 

 hairy. Mamnife variable, ranging from 2 — 2 =8 or 3 — 2 = 10 

 to a continuous series attaining a total of 11, different num- 

 bers often occurring in the same species. 



Skull delicate, lightly built, the supraorbital edges square 

 in old specimens, divergent and slightly ridged in the larger 

 species ; zygomatic plate not cut back anteriorly. 



Molars small, brachyodont. 



Type. //. himaculatus [Mas himaculatus, Waterh.). 



Other species : — 



Hesperomys callosus, Rengg. {Mas callosus). 



„ ,, hoUvue,^\\os. ( Eligmodontia c. holioiw). 



,, carillay Thos. [Eligmodontia carilla). 



„ ducilla, Thos. (^E. ducilla). 



,, expulsus, Lund (3Ius expulsus). 



„ gracilipes, Waterh. (Mus gracilipes). 



,, laucha, Desm. {Mus Inucha). 



„ ,, musciilinus, Thos. (^Eligmodontia I. 



muscuiina). 



„ lepidus, Thos. ( Ilespei'omys himaculatus lepidus). 



„ sorella, Thos. (^Eligmodontia sorella). 



,, tener, Winge. 



„ venustusy Thos. [Oryzomi/s (?) venustus). 



Graomys, gen. nov. 



Size comparatively large. ' General appearance graceful, 

 with long ears and long fine fur. Tail longer than head and 

 body, thickly hairy, pencilled terminally, prominently bicolor. 

 Feet normal, with the usual pads small and well defined, 

 the space between them coarsely granulated. Mammte 

 2—2 = 8. 



